Role of the progress variable in models for partially premixed turbulent combustion

It is shown that if partially premixed combustion is described in terms of a mixture fraction and a progress variable, scalar dissipation terms appear in the transport equation for the progress variable. These terms are essential if not only the fully premixed limit but also the transport equation f...

Full description

Saved in:
Bibliographic Details
Published in:Combustion and flame 2005-06, Vol.141 (4), p.431-437
Main Authors: Bray, Ken, Domingo, Pascale, Vervisch, Luc
Format: Article
Language:English
Subjects:
Applied sciences
Breakup
Combustion
Combustion. Flame
Diffusion flames
Dissipation
Eddies
Energy
Energy. Thermal use of fuels
Engineering Sciences
Exact sciences and technology
Fluids mechanics
Mathematical models
Mechanics
Partial premixing
Progress variable
Scalars
Theoretical studies. Data and constants. Metering
Transport equations
Turbulent combustion
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:It is shown that if partially premixed combustion is described in terms of a mixture fraction and a progress variable, scalar dissipation terms appear in the transport equation for the progress variable. These terms are essential if not only the fully premixed limit but also the transport equation for a classical diffusion flame are to be recovered. The eddy breakup relationship between mean rate of reaction and scalar dissipation is extended to partially premixed combustion at high Damköhler numbers. Advantages and disadvantages of working in terms of a progress variable rather than a major species mass fraction or temperature are identified and discussed.
ISSN:0010-2180
1556-2921
DOI:10.1016/j.combustflame.2005.01.017